CN113272163B - Device for fastening an air spring with acoustic decoupling - Google Patents

Device for fastening an air spring with acoustic decoupling Download PDF

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Publication number
CN113272163B
CN113272163B CN202080008263.0A CN202080008263A CN113272163B CN 113272163 B CN113272163 B CN 113272163B CN 202080008263 A CN202080008263 A CN 202080008263A CN 113272163 B CN113272163 B CN 113272163B
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CN
China
Prior art keywords
air spring
body part
plastic part
plastic
fastening
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Application number
CN202080008263.0A
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Chinese (zh)
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CN113272163A (en
Inventor
K·M·劳滕伯格
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Continental Automotive Technologies GmbH
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Continental Automotive Technologies GmbH
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Publication of CN113272163A publication Critical patent/CN113272163A/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G11/00—Resilient suspensions characterised by arrangement, location or kind of springs
    • B60G11/26—Resilient suspensions characterised by arrangement, location or kind of springs having fluid springs only, e.g. hydropneumatic springs
    • B60G11/28—Resilient suspensions characterised by arrangement, location or kind of springs having fluid springs only, e.g. hydropneumatic springs characterised by means specially adapted for attaching the spring to axle or sprung part of the vehicle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G15/00—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type
    • B60G15/08—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having fluid spring
    • B60G15/12—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having fluid spring and fluid damper
    • B60G15/14—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having fluid spring and fluid damper the damper being connected to the stub axle and the spring being arranged around the damper
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
    • F16B35/04—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
    • F16B35/041—Specially-shaped shafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B43/00—Washers or equivalent devices; Other devices for supporting bolt-heads or nuts
    • F16B43/001—Washers or equivalent devices; Other devices for supporting bolt-heads or nuts for sealing or insulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B5/00—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them
    • F16B5/02—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of fastening members using screw-thread
    • F16B5/0241—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of fastening members using screw-thread with the possibility for the connection to absorb deformation, e.g. thermal or vibrational
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/06—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid
    • F16F9/08—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid where gas is in a chamber with a flexible wall
    • F16F9/084—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid where gas is in a chamber with a flexible wall comprising a gas spring contained within a flexible wall, the wall not being in contact with the damping fluid, i.e. mounted externally on the damper cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/54—Arrangements for attachment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
    • B60G2202/10—Type of spring
    • B60G2202/15—Fluid spring
    • B60G2202/152—Pneumatic spring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
    • B60G2204/10—Mounting of suspension elements
    • B60G2204/12—Mounting of springs or dampers
    • B60G2204/126—Mounting of pneumatic springs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
    • B60G2204/40—Auxiliary suspension parts; Adjustment of suspensions
    • B60G2204/41—Elastic mounts, e.g. bushings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
    • B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
    • B60G2206/40—Constructional features of dampers and/or springs
    • B60G2206/42—Springs
    • B60G2206/424—Plunger or top retainer construction for bellows or rolling lobe type air springs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
    • B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
    • B60G2206/70—Materials used in suspensions
    • B60G2206/71—Light weight materials
    • B60G2206/7104—Thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
    • B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
    • B60G2206/70—Materials used in suspensions
    • B60G2206/73—Rubber; Elastomers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2600/00—Indexing codes relating to particular elements, systems or processes used on suspension systems or suspension control systems
    • B60G2600/44—Vibration noise suppression
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B37/00—Nuts or like thread-engaging members
    • F16B37/04—Devices for fastening nuts to surfaces, e.g. sheets, plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/02—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum
    • F16F9/04—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum in a chamber with a flexible wall
    • F16F9/0454—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum in a chamber with a flexible wall characterised by the assembling method or by the mounting arrangement, e.g. mounting of the membrane

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vehicle Body Suspensions (AREA)
  • Fluid-Damping Devices (AREA)

Abstract

The invention relates to a device for fastening an air spring (2) to a body part (21) of a motor vehicle, comprising at least an air spring cover (4) which comprises at least one fastening means (22) by means of which the air spring (2) can be connected to the body part (21) of the motor vehicle. For connecting the air spring (2), a fastening element (22) is inserted through an opening of the body part (21) and is fastened to the body part in a force-fitting manner by means of a fastening element (26). The first and second plastic parts (23; 4, 24, 25) are provided for acoustic decoupling of the air spring (2). The first plastic part (23) is clamped between the body part (21) and the fastening element (26), and the second plastic part (4, 24, 25) is positioned below the body part (21).

Description

Device for fastening an air spring with acoustic decoupling
Technical Field
The present invention relates to a device for fastening an air spring to a body part of a motor vehicle according to the preamble of claim 1.
Background
The air springs are arranged between the chassis or wheel carrier of the motor vehicle and the motor vehicle body, thereby performing the function of providing cushioning to the wheels. The air spring is substantially composed of an air spring cover, a rolling piston and a diaphragm folding bladder clamped in an airtight manner between the air spring cover and the rolling piston, thereby defining a working chamber under air pressure. The diaphragm folding bladder is surrounded by a sleeve-shaped outer guide and, during spring compression, rolls on the concentric rolling piston by forming a rolling fold. By means of the air spring cover, the air spring strut is connected to the motor vehicle body by means of suitable fastening means. Stud bolts or screws are typically used. The screw or bolt is hereby recessed/introduced in an airtight manner into the air spring cover and is screwed substantially by means of a nut.
As air spring struts, vibration dampers are arranged in the air springs, which dampen vibrations of the wheels or of the motor vehicle body. The shock absorber is connected on the one hand to the wheel carrier and on the other hand is fixed by means of its piston rod, which can extend into the shock tube, via a damping bearing into the air spring cover. In particular in the dynamic operation of air spring struts, high tensile and compressive forces act in particular on the pot-shaped bearing seat of the air spring cover. These forces are transmitted into the motor vehicle body via the air spring cover.
Typically, the air spring cover is directly against the vehicle body by means of its upper side. Structural sound waves are introduced into the vehicle body as a result of chassis operation, these structural sound waves constituting an unpleasant noise source. There is an increasing demand for acoustic decoupling of chassis noise into the interior of vehicles. Since chassis noise is no longer covered by engine noise and is therefore considered unpleasant by the vehicle user, new standards in terms of vehicle interior isolation are set, in particular, by development developments in relation to electric vehicles.
A construction is known, for example, from DE 1020110223216 A1, in which an acoustic decoupling system comprising a threaded connection is described. In said publication, a description is given of an acoustic bearing, which is composed of a plurality of discs and is arranged between an air spring cover and a vehicle body part. Solid disks made of steel, aluminum or plastic are used, at least one layer made of an elastomer material (for example polyurethane) being arranged between the solid disks. The fastening means for connecting the air spring strut to the vehicle body part are inserted through the acoustic bearing. This configuration allows both tensile and compressive forces to be transmitted simultaneously and acoustic decoupling to be achieved by means of the elastomeric material. As a result, it is intended to prevent sound waves from being conducted/transmitted into the vehicle body in an unobstructed manner, ultimately into the vehicle interior.
The sound waves transmitted from the air spring cover to the vehicle body part are suppressed by the elastomer element. However, the screw connection of this acoustic bearing is complex and cumbersome during assembly. Firstly, three fastening means are provided in the air spring cover, by means of which fastening means the air spring cover is connected to the acoustic bearing, and secondly, three further fastening means are provided, which are recessed into the acoustic bearing, by means of which further fastening means the acoustic bearing is in turn connected to the vehicle body part. In this way, it is intended to practically prevent a direct metallic force path between the air spring cover and the vehicle body in order to create structural acoustic isolation. However, due to the bolt-to-acoustic bearing inner solid disk and screw connection to the body part, direct metal contact still occurs.
Disclosure of Invention
It is therefore an object of the invention to improve acoustic decoupling in the case of fixing an air spring to a part of a motor vehicle body.
The object of the invention is achieved by means of the features of the independent claims.
According to the invention, a device for fastening an air spring to a body part of a motor vehicle is provided, comprising at least an air spring cover, wherein the air spring cover comprises at least one fastening means by means of which the air spring can be connected to the body part of the motor vehicle, wherein for the purpose of connecting the air spring the fastening means are inserted through an opening of the body part and are fastened to the body part in a force-locking manner by means of fastening elements, wherein a first plastic part and a second plastic part are provided for acoustic decoupling of the air spring, wherein the first plastic part is clamped between the body part and the fastening elements, and the second plastic part is provided to be positioned under the body part. The air spring cover is preferably made of a thermoplastic or thermoset.
In order to prevent direct metal contact in the case of an air spring cover connected to a vehicle body part, the use of a suitable plastic material according to the invention therefore makes use of the reflection effect at the boundary surface of the contact part during the transmission of the structural sound waves. In this case, the first plastic part and the second plastic part are in the force path of the connection, so that the transmission of the structural sound waves from the air spring cover to the fastening means is suppressed during propagation in the body part. Here, this structure reduces the effective connecting surface of these components and ensures that the securing means are spaced apart from the body part. Thus, the effective surface for structural sound transmission is significantly reduced by the geometry of the first and second plastic parts. Furthermore, the different material properties of plastics have the effect of reducing sound compared to metals.
The mechanical decoupling of the fastening means from the body part by means of the use of two plastic parts also results in a significant weight reduction and thus also in a cost reduction. Further, the construction according to the invention has a number of different external construction possibilities.
According to a preferred embodiment, the second plastic part is a sleeve which is pushed onto the securing means such that the air spring cover is spatially separated from the body part. The sleeve is positioned between the air spring cover and the underside of the body part and thus acts as a spacer.
According to another preferred embodiment, the second plastic part is a ring which is pushed onto the fixing means, the ring ending flush with the air spring cover such that the ring and the air spring cover abut against the body part. In this configuration, the ring as the second plastic part is embedded in the air spring cover, so that the upper sides of both the ring and the air spring cover bear against the underside of the body part in a planar manner. This solution does not increase the axial installation space requirements and ensures acoustic decoupling as such. It is important here that the ring is in the axial force path of the securing means and the securing element.
According to a further alternative embodiment, the second plastic part is formed from the material of the air spring cover, said second plastic part surrounding the fastening means in an annular manner, so that the air spring cover abuts against the body part. In this configuration, the ring is replaced by the material of the air spring cover, wherein the material surrounds the fastening means such that the material is likewise in the axial force path of the fastening means and the fastening element and ensures that the fastening means is spaced apart from the body part.
According to a further preferred embodiment, the first plastic part is a disc. This disc serves as a preload element and ensures that there is sufficient preload to secure the fixation element to the fixation device in a suitable manner. It also ensures that the fixing element made of metal is spatially separated from the body part, as a result of which no direct metal contact is present. The discs are likewise geometrically designed such that the effective surface contact with respect to the body part is as small as possible to ensure the greatest possible reflection of the structural sound waves.
According to a further preferred embodiment, the securing means is smaller in diameter than the through-hole of the body part. Thus, direct metal contact between the fixing means and the body part is avoided both in the axial direction and in the radial direction, it being ensured that the fixing means does not abut against the body part. Thus, the diameter of the shaft of the securing means is dimensioned smaller than the diameter of the through hole through which the securing means is pushed.
According to a further preferred embodiment, the first plastic part and/or the second plastic part are made of thermoplastic. In order to ensure a sufficient preload of the first plastic part, radiation-crosslinked thermoplastics are particularly advantageous, since they have high creep properties. This ensures that the preload of the securing means does not decrease to an unacceptable extent over the service life.
In the case of such plastics, the creep modulus is a critical characteristic variable. The creep modulus describes the time dependent loading of the plastic when considering mechanical stress and time based strain. Thus, according to an example, a thermoplastic with a creep modulus according to ISO 899-1 of (0.5% 1000h [ hr ]) of 700MPa is used.
As an alternative preferred embodiment, the first plastic part and/or the second plastic part are made of a thermosetting plastic. Thermosets are particularly advantageously suitable for obtaining a preload, since thermosets do not tend to exhibit creep.
The fastening device according to the invention can be used in the case of a free-standing air spring, but according to a further preferred embodiment can also be used in the case of an air spring with a built-in damper, that is to say an air spring strut.
The device is used in the chassis of a motor vehicle.
Drawings
Further preferred embodiments of the invention will emerge from the dependent claims and the following description of exemplary embodiments with reference to the drawings,
in the drawings:
figure 1 shows an air spring strut according to the prior art,
figure 2 shows a first exemplary connection of an air spring strut,
FIG. 3 illustrates a second exemplary connection of an air spring strut, an
Fig. 4 shows a third exemplary connection of an air spring strut.
Detailed Description
Fig. 1 shows a known air spring strut 1 having the main components, namely an air spring 2 and a damper 3, wherein the air spring 2 comprises an air spring cover 4, a rolling piston 5 and a diaphragm folding airbag 6 having an outer guide 7 which surrounds the diaphragm folding airbag in a sleeve-like manner. The shock absorber 3 is arranged in the air spring 2, the shock absorber 3 comprising a shock tube 14 into which the piston rod 15 can extend, and a damping bearing 11.
The air spring strut 1 performs two functions: on the one hand, the air spring 2 generates a supporting force, while the damper 3 is responsible for the linear guidance. The fastening means on the air spring cover 4 allow the air spring strut 1 to be fastened on the one hand to the motor vehicle body and on the other hand to the wheel carrier of the motor vehicle chassis via a damper eye (not shown), as a result of which the motor vehicle is spring-supported and damped.
This conventional mounting position of the air spring post determines the "up/down" orientation.
The air spring 2 comprises a diaphragm fold airbag 6 of elastomeric material, the diaphragm fold airbag 6 defining with the air spring cover 4 and the rolling piston 5 an airtight, elastic volume working chamber 10, which can be filled with compressed air. The hose-like diaphragm folded airbag 6 is fixed at its first end to the air spring cover 4 and at its second end to the rolling piston 5 via a clamping ring 18 at the connection region of these air spring connections.
In the case of a relative movement of the air spring support 1 along the longitudinal axis L between the air spring cover 4 and the rolling piston 5, the diaphragm folding bellows 6 rolls on the concentric rolling surfaces of the rolling piston 5 with the formation of the rolling fold 8. Further, the diaphragm folding bladder 6 forms a universal fold structure 9 on the air spring cover 4, which serves as a universal bearing. Meanwhile, the diaphragm folding airbag 6 is provided with an embedded strength member.
In particular in the case of comfortable axial bellows, that is to say with the strength members oriented in the axial direction, the outer guide 7 is used to limit the lateral expansion of the membrane folded airbag 6. Here, the outer guide 7 is clamped against the diaphragm folding airbag 6 by means of an inner locking ring 12 provided in the working chamber 10.
In order to protect the rolling fold structure 8 from contamination, a folding bellows 19 is provided, which is fixed, for example, to the wheel carrier-side end region of the outer guide 7 and to the shock tube 14.
The additional spring 16 is arranged to bear against the underside of the air spring cover 4 and to face the damper. The additional spring 16 has a through-hole for the piston rod 15 and thus encloses the piston rod. During spring compression, the end of the shock tube 14 moves laterally towards the air spring cover 4, and thus the additional spring 16 acts as a travel limiter and dampens possible forces acting on the air spring cover 4.
The damping tube 14 of the shock absorber 3 is arranged within the rolling piston 5 or at least surrounded in a specific region by a hollow cylindrical rolling piston 5, the rolling piston 5 being either secured in a projecting manner on the damping tube via a support ring 17 or suspended on the end side of the damping tube 14 via a bearing element 13. Combinations of upright and suspended rolling pistons 5 are also possible, as can be seen in the figures. In addition, it is known to manufacture the rolling piston 5 from a light metal (such as aluminum) or a fiber reinforced plastic.
With the rolling piston 5 standing upright, a sealing system 20, for example made of an elastomeric sealing ring, is arranged between the opposite outer walls of the shock tube 14 facing the end region of the wheel carrier. This serves to seal the working chamber 10 of the air spring 2 against the outside, which working chamber can expand in the rolling piston.
An exemplary manner of securing the air spring strut to the body part is described with reference to the following figures.
Fig. 2 shows a detail of a first exemplary connection of the air spring cover 4 of the air spring strut to the body part 21. The securing means 22 are at least partially recessed into the air spring cover 4 of the air spring support. The fixing means represent a plurality of fixing means by means of which the air spring cover 4 is fixed to the body part 21. Preferably, three fastening means are provided on the air spring cover 4, which fastening means are distributed in the circumferential direction.
The fastening means 22 are embodied in the form of bolts, which are enclosed in the air spring cover 4. The air spring cover 4 is preferably manufactured from a plastic material. A part of the securing means 22 is provided with an external thread and protrudes from the air spring cover 4. The shaft is inserted through a corresponding through hole of the body part 21. For the force-locking connection of the air spring support, the fastening means 22 are fastened to the upper side of the body part 21 by means of fastening elements 23 in the form of nuts. The fixing element 23 is equipped with an internal thread and is supported by the fixing means 22 such that the air spring cover 4 is firmly fixed to the body part 21. Other fixation schemes are also possible.
In order to prevent the direct transmission of structural sound into the motor vehicle body, an acoustic decoupling system in the form of two plastic parts is provided according to an example.
A first plastic part 23 in the form of a disc is positioned between the fixing element 26 and the body part 21. When the fixing element 26 is screwed down, the plastic part 23 is supported and generates a clamping force for fastening the fixing means 22.
The second plastic part 24 in the form of a sleeve is pushed onto the shaft of the fastening means 22 in advance and is thus positioned between the air spring cover 4 and the body part 21. The second plastic member 24 abuts against the underside of the vehicle body portion 21, and serves as a spacer. Here, it should be ensured that the underside of the second plastic part 24 rests on the annular surface of the fastening means 22 in order to be effective. In this configuration, the annular surface of the securing means 22 ends flush with the upper side of the air spring cover 4.
The fixing device 22 and the body part 21 are metal elements. Because of their almost identical material properties, the fastening means and the body part should be arranged separately from each other in order to prevent an uninhibited transmission of the structural sound waves. That is, there should be no direct metal contact between the securing means 22 and the body part 21. For this purpose, as can be seen from fig. 2, the diameter of the shaft of the fastening means 22 is smaller than the through-opening of the body part 21 provided for said means.
The two plastic parts 23, 24 are arranged such that the structural sound waves conducted from the air spring cover 4 into the fastening means 22 are not transmitted directly into the body part 21. By means of the two plastic parts 23, 24, during the introduction into the body part 21, the structural sound waves are largely reflected and thus also absorbed. The structural sound is not transmitted directly into the motor vehicle body, but is effectively reduced by the plastic parts 23, 24.
According to an example, the two plastic parts 23, 24 thus ensure an acoustic decoupling of the connection of the air spring strut to the body part 21, while the fastening means 22 ensure that tensile and compressive forces are absorbed.
Suitable materials for the plastic parts 23, 24 are plastics with high creep properties, that is to say a high creep modulus. These plastics are thermoplastics whose creep properties have been optimized, for example, by radiation crosslinking, or are likewise thermosets with suitable creep properties.
In order to ensure that the fastening means 22 is fastened by means of the fastening element 23 in a permanent manner and under load, the fastening must be effected with a defined preload. Here, the elastic deformation is allocated to the first plastic part 23 and the second plastic part 24 depending on the area and rigidity of these plastic parts.
Fig. 3 shows a partial detail of a second exemplary connection of the air spring support, in this case the second plastic part being designed in the form of a ring 25. The function and manner of operation of the second exemplary embodiment is the same as that of the first exemplary embodiment of fig. 2.
Instead of positioning the sleeve under the body part 21, the ring 25 as a second plastic part is pushed onto the shaft of the securing means 21, so that it acts as a buffer. The ring 25 is embedded in the air spring cover 4 in such a way that the upper side of the ring 25 ends flush with the upper side of the air spring cover 4 and the lower side of the ring 25 rests on the annular surface of the fastening means 22. That is, in the connected state of the air spring support, the upper side of the ring 25 abuts against the lower side of the vehicle body part together with the upper side of the air spring cover 4.
Furthermore, the second plastic part 25 constitutes a metallic decoupling of the fastening means 22 with respect to the body part 21, since it is in the axial force path of the annular surface of the fastening means 22 and the underside of the body part 21, the fastening means 22 not directly contacting the body part 21.
In order to produce an acoustically decoupled mode of action by means of the two plastic parts, the second plastic part 25 has a special manufacturing process. First, the securing means 22 comprise undercut grooves towards their annular surface, so that the inner wall of the second plastic part 25 only at least partially abuts against the shaft of the securing means 22. Further, the outer diameter of the second plastic part 25 is smaller than the diameter of the corresponding cutout in the air spring cover 4. That is, the outer wall of the second plastic part 25 is not in contact with the material of the air spring cover 4 in the radial direction.
In the third exemplary embodiment shown in fig. 4, the second plastic part is omitted. In the region of the undercut, the axis of the fastening means 22 is surrounded by the material of the air spring cover 4, so that said material serves as a spacer between the fastening means 22 and the body part 21. The material for the air spring cover 4 is a thermoplastic or a thermosetting plastic. Since the air spring cover made of plastic material is used as the second plastic part and its upper side rests against the underside of the body part 21, this structural design also causes acoustic decoupling. As a result, the fastening means 22 is likewise acoustically decoupled from the body part 21. Thus, the function and manner of action of this third exemplary embodiment is the same as the first exemplary embodiment of fig. 2 as well.
List of reference numerals
1. Air spring strut
2. Air spring
3. Vibration damper
4. Air spring cover
5. Rolling piston
6. Diaphragm folding air bag
7. Outer guide
8. Rolling folding structure
9-universal folding structure
10. Working room
11. Damping bearing
12. Inner locking ring
13. Support element
14. Shock-absorbing tube
15. Piston rod
16. Additional spring
17. Support ring
18. Clamping ring
19. Folding corrugated pipe
20. Sealing system
21. Vehicle body part
22. Fixing device
23. Disc
24. Sleeve barrel
25. Ring(s)
26. Fixing element
L longitudinal axis

Claims (9)

1. Device for fastening an air spring (2) to a body part (21) of a motor vehicle, which device comprises at least an air spring cover (4), wherein the air spring cover (4) comprises at least one fastening means (22) by means of which the air spring (2) can be connected to the body part (21) of the motor vehicle, wherein, for the purpose of connecting the air spring (2), the fastening means (22) are inserted through an opening of the body part (21) and are fastened to the body part in a force-locking manner by means of fastening elements (26), characterized in that a first plastic part and a second plastic part are provided for acoustically decoupling the air spring (2), wherein the first plastic part (23) is clamped between the body part (21) and the fastening elements (26), and the second plastic part is arranged to be positioned under the body part (21), wherein the fastening means (22) comprise undercut towards its annular surface such that the inner wall of the second plastic part is only partially resting against the shaft of the fastening means (22), and the diameter of the second plastic part (4) is smaller than the diameter of the outer plastic part of the air spring (4) in the radial direction of the air spring, so that the outer diameter of the air spring (4) does not contact the outer wall of the plastic part.
2. The device according to claim 1, characterized in that the second plastic part is a sleeve (24) which is pushed onto the securing means (22) such that the air spring cover (4) is spatially separated from the body part (21).
3. The device according to claim 1, characterized in that the second plastic part is a ring (25) which is pushed onto the securing means (22) and which terminates flush with the air spring cover (4) such that the ring (25) and the air spring cover (4) abut against the body part (21).
4. A device according to any one of claims 1 to 3, characterized in that the first plastic part (23) is a disc.
5. The device according to claim 1 or 2, characterized in that the securing means (22) are smaller in shaft diameter than the through-hole of the body part (21).
6. The device according to claim 1 or 2, characterized in that the first plastic part and/or the second plastic part are made of thermoplastic.
7. The device according to claim 1 or 2, wherein the first plastic part and/or the second plastic part is made of a thermosetting plastic.
8. A device according to claim 1 or 2, characterized in that the air spring (2) comprises a built-in damper (3).
9. A motor vehicle comprising a chassis having an apparatus as claimed in any one of claims 1 to 8.
CN202080008263.0A 2019-02-04 2020-02-03 Device for fastening an air spring with acoustic decoupling Active CN113272163B (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102019201357.0 2019-02-04
DE102019201357.0A DE102019201357A1 (en) 2019-02-04 2019-02-04 Device for fastening an air spring with acoustic decoupling
PCT/EP2020/052549 WO2020161043A1 (en) 2019-02-04 2020-02-03 Device for securing a pneumatic spring with an acoustic decoupling function

Publications (2)

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CN113272163A CN113272163A (en) 2021-08-17
CN113272163B true CN113272163B (en) 2024-03-22

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CN (1) CN113272163B (en)
DE (1) DE102019201357A1 (en)
WO (1) WO2020161043A1 (en)

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CN1282687A (en) * 1999-07-30 2001-02-07 卡尔·弗罗伊登伯格公司 Shock reducing pillar supporting cradle
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WO2020161043A1 (en) 2020-08-13
US11827066B2 (en) 2023-11-28
CN113272163A (en) 2021-08-17
US20220118809A1 (en) 2022-04-21
DE102019201357A1 (en) 2020-08-06

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